BandArithmetic

Synthèse

Performs an arithmetic operation on the bands of a multiband raster object and returns a raster object with the operation applied.

Discussion

For more information about the methods and band orders used with this function, see the Band Arithmetic raster function.

The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.

Syntaxe

BandArithmetic (raster, band_ids, {method})

Paramètre	Explication	Type de données
raster	The input raster.	Raster
band_ids	The band IDs to use in the arithmetic operation, separated by a space. Band IDs are indexed using one-based indexing, so that the first band in a list of bands in a multiband raster object has an index of 1. The bands should be provided in the order that is required by the arithmetic method. For information about the order of bands needed for each method, see Band Arithmetic.	String
method	The arithmetic operation to apply to the bands. A custom operation can also be defined. 1— NDVI 2—SAVI 3— TSAVI 4—MSAVI 5—GEMI 6—PVI 7—GVITM 8—Sultan 9—VARI 10—GNDVI 11—SR 12—NDVIre 13—SRre 14—MTVI2 15—RTVICore 16—CIre 17—CIg 18—NDWI 19—EVI 20—Iron oxide 21—Ferrous minerals 22—Clay minerals 23—WNDWI (La valeur par défaut est 1)	Integer

Valeur renvoyée

Type de données	Explication
Raster	The output raster object with the band arithmetic applied.

Exemple de code

BandArithmetic example 1

Calculates the Simple Ratio (SR) for a Landsat 8 image.

import arcpy

SimpleRatio = arcpy.ia.BandArithmetic("Landsat8.tif","5 4", 11)

BandArithmetic example 2

Calculates a custom operator for a Landsat 8 image.

import arcpy

BandAddition_raster = arcpy.ia.BandArithmetic("Landsat8.tif","B2+B3", 0)